public async Task UpdateQuestion(apiModels.Question question)
{
if (question == null)
{
throw new ArgumentNullException(nameof(question));
}
var text = question.Text.TrimToNull();
if (text == null)
{
throw new InvalidOperationException("Question With Empty Text cannot be updated!");
}
var dbQuestion = await _dbContext.Question.Include(i => i.Answer).FirstOrDefaultAsync(q => q.Id == question.Id) ?? throw new InvalidOperationException("Wrong Question Id Provided.");
dbQuestion.Text = text;
dbQuestion.CorrectAnswerId = question.CorrectAnswer?.Id;
if (question.AvailableAnswers?.Any() == true)
{
await _dbContext.SaveChangesAsync();
foreach (var answer in question.AvailableAnswers.Where(w => dbQuestion.Answer.All(a => a.Text != w.Text)).ToList())
{
await CreateAnswer(dbQuestion.Id, answer);
}
}
await _dbContext.SaveChangesAsync();
}
public async Task CreateQuestion(int quizId, apiModels.Question question)
{
if (question == null)
{
throw new ArgumentNullException(nameof(question));
}
var questionText = question.Text.TrimToNull();
if (questionText == null)
{
throw new InvalidOperationException("Question Cannot be created with Empty Text!");
}
var dbQuiz = await _dbContext.Quiz.FirstOrDefaultAsync(q => q.Id == quizId) ?? throw new InvalidOperationException("Wrong Quiz Id Provided.");
var dbQuestion = new Question {
Text = questionText, QuizId = dbQuiz.Id, CorrectAnswerId = question.CorrectAnswer?.Id
};
_dbContext.Question.Add(dbQuestion);
if (question.AvailableAnswers?.Any() == true)
{
await _dbContext.SaveChangesAsync(); // we need question Id
foreach (var answer in question.AvailableAnswers)
{
await CreateAnswer(dbQuestion.Id, answer);
}
}
if (question.CorrectAnswer != null)
{
throw new InvalidOperationException("you cannot create Question with correct answer when you dnt know the answer id");
}
await _dbContext.SaveChangesAsync();
}
public static apiModels.Question ToApiModel(dbModels.Question question)
{
if (question == null)
{
return(null);
}
var apiModelQuestion = new apiModels.Question {
Id = question.Id, Text = question.Text
};
if (!question.Answer.Any())
{
return(apiModelQuestion);
}
apiModelQuestion.AvailableAnswers = question.Answer.Select(ToApiModel).ToList();
apiModelQuestion.CorrectAnswer = question.CorrectAnswerId.HasValue ?
ToApiModel(question.Answer.First(f => f.Id == question.CorrectAnswerId)) : null;
return(apiModelQuestion);
}
